Improvement in pipe-cutting machines



N. WATSON.

PIPE-CUTTING'MACHINE.

Patented May15,1877.

QNZENTUB ATTUBNEYS.

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UNITED STATES PATENT OFFICE.

IMPROVEMENT IN PIPE-CUTTING MACHINES.

Specification forming part of Letters Patent No. 190,798, dated May 15,1877; application filed April 23, 1877.

To all whom it may concern:

Be it known that I, NEHEMIAH WATSON, of Arcadia, in the county of Washington and State of Rhode Island, have invented a new and Improved Pipe-Cutting Machine, of which the following is a specification In the accompanying drawing, Figure 1 represents a vertical longitudinal section of my improved machine for cutting steam and gas pipes. Fig. 2 is a top view, and Fig. 3 a vertical transverse section of the s ime.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish for practical plumbers and repairers of steam and gas pipes an improved machine that is capableof cutting off steam, gas, and water pipes in the smallest space and with the samedegree of perfection as it done in the shop, the device being small and portable, and applied without destroying anyparts of the pipes, elbows, &c., as by the present mode.

The invention consists, essentially, of a revolving circular saw, capable of cutting iron, and of a clamp for grasping the pipe and holding the machine in place during the forward feeding and cutting of the saw.

In the "drawing, A represents the main frame of my improved pipe-cutting machine, and B B are, respectively, a fixed-end crossbar and a movable cross-bar, which carry the longitudinal crank-shaft O.

The crank-shaft imparts, by a bevel-wheel, a, at its end, intermediate bevel-Wheel b, cog wheel d, and a pinion, d, revolving motion to a lateral shaft, at whose outer end a circular saw, D, is applied, that is parallel to the longitudinal axis of the main frame, and revolved by the turning of crank-shaft and by the intermeshing gear.

The main frame A slides, by a dovetailbottom recess, on the bar of a clamping-jaw,

E, which, together with a jaw, E, at the end of frame A, and a thumb-screw, F, passing through projections of the jaw-bar and main frame, is applied with considerable power to the pipe or other object to be out, so as to be able to resist the strain exerted thereon during the cutting process. The thumb-screw is so located near the crank as to be accessible in whatever position the machine may be placed.

The feed or progressive motion of the saw through the pipe during the cutting motion is obtained by turning a thumb-screw, G, which, in its turn, moves a section, A, of the main frame, to which the saw, gear, and crank-shaft are connected. This section or bar A slides in longitudinal guide-slots of the side bar of frame A, so as to admit the forward motion of the saw while the main frame is rigidly clamped to the pipe.

The thumb-screw C encircles the crankshaft C, bears, byits endor head, on the movable cross-piece B, and engages a fixed collar, B of the same, for the purpose of carrying the saw back after use.

The crank may be removed by a ratchet or a bit-brace to venience of the operator.

The machine may be used with great advantage in cutting out a piece of pipe for the insertion of a T to connect another servicepipe. The exact length may be removed without taking out the pipe, leaving the ends as round and perfect as if out on a lathe. It may also be used for cutting off iron rods or bolts, effecting a saving in time, tools, material and labor.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, in a pipe-cutting machine, of an adjustable clamping-frame, with a loligitudinally-teeding and revolving circular cutting-saw, substantially in the manncrset forth.

2. The combination of the main frame, attached by clamp-jaws and thumbscrews to the pipe to be cut, with a circular revolving saw applied to a longitudinally-sliding and guided section, A, of the main frame, and moved by a feeding thumb-screw, O, substantially in the manner specified.

3. The combination of the sliding and guided bar A of frame A, carrying cutting-saw, operating gear, and crank-shaft, with a feedingthumb'screw, 0, around crank-shaft, crossbar B and collar-plate B substantially as and for the purpose described.

NEHEMIAH WATSON.

and replaced suit the con- Witnesses:

THOMAS W. MORGAN, ANSON GREENE. 

